GRB 040323, a dark GRB ? Castro-Tirado, A. J. ; Gorosabel, J. ; de Ugarte Postigo, A. ; Tristram, P. ; Yock, P. ; Jelinek, M. ; Perez-Ramirez, M. D. ; Castro Cerón, J. M. Abstract Publication: GRB Coordinates Network Pub Date: 2004 Bibcode: 2004GCN..2553....1C